I also use Morris oil.
The link below is from their site, there may be alternatives or maybe even better oil, but I don't think you can go far wrong with a brand company that was supplying oil in the air cooled era and now has a classic oil that they specifically recommend for the vw air cooled engine:thumbup:
I've not found another company that have such specific info published specifically on the classic vw requirements
https://www.morrislubricants.co.uk/lubricants/company.asp?wp=96
Pete
harveypj wrote: